linux-kernel - Re: [PATCH V2 9/9] ARM: dts: stm32: add initial support of stm32mp157c eval board

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Message-ID: <33a7afc4-9282-5359-1f80-ef9f3da93c38@st.com>
Date:   Thu, 21 Dec 2017 11:44:55 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Ludovic Barre <ludovic.Barre@...com>,
        Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Gerald Baeza <gerald.baeza@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH V2 9/9] ARM: dts: stm32: add initial support of
 stm32mp157c eval board



On 12/21/2017 10:18 AM, Linus Walleij wrote:
> On Wed, Dec 20, 2017 at 10:19 AM, Alexandre Torgue
> <alexandre.torgue@...com> wrote:
>> On 12/20/2017 08:44 AM, Linus Walleij wrote:
> 
>>> gpio-line-names = "foo", "bar" ...;
>>>
>>> See for example
>>> arch/arm/boot/dts/bcm2835-rpi-a.dts
>>> arch/arm/boot/dts/ste-snowball.dts
> (...)
>>
>> It looks like useful for pins used as gpio line. Are you saying that we also
>> have to describe pins used as Alternate Function ?
> 
> No. The use of the names is up to the platform maintainer (you),
> leaving a blank string for non-GPIO lines is just fine.
> 
> Some platforms add the name of the actual function used by the
> line on the design, if it is not GPIO, sometimes something in
> brachets like "[i2c0-SDA]" that says what it is used for and explains
> why you can't use it for GPIO on this setup.
> 
> But just leaving it blank is just as good.

Ok thanks Linus. I will take it into account. It could be useful to add 
it for MCU and future MPU boards.

Regards
Alex


> 
> Yours,
> Linus Walleij
>